Помогите!

We...(not / to go) by because there...( to be) too much traffic in big cities. We...(not / to go) by train
because it...( to take) much time. Besides, there... ( to be) no return tickets for the dates we asked.
My father... ( alredy / to buy ) plane tickets. This is the first time... ( to travel ) by air. I am really excited.


для справки например: My father... ( alredy / to buy ) plane tickets. ( в этом предложении вставить вместо точек слово alredy или to buy